Germany has removed the US from it’s “Hot Spots” list. You will still need your CDC vaccination card-cellphone photos are not valid-or recent negative tests, but quarantines are no longer required. The same is true for Canada and several other countries and regions. The official site for this info is the Robert Koch Institute for Infectious Diseases. The linked article is from Deutsche Welle, which is an excellent source for German news in English.
Now that the US and Canada are no long considered a risky area (risiko Gebiet) the German Consulate tells me the Digital Registration is no longer required. Gute Reise!